Thinking of making the move to Canon this summer & just wanted to get a general idea of what Canon's QC is like in terms of their higher end lenses. By that I mean how often would you have to go and get you body & lenses calibrated when buying new L glass.

That and are Canon service centres pretty good about it with said gear still under warranty?

I know both Nikon & Canon don't publicise their fault tolerances as oppose to Zeiss & other companies so I'm guessing that it'll be a similar situation to FX lenses.